Netflix accounts can get banned very fast, so you need to follow some rules.
If the account has a different language, make a profile with the name 'Guest' and change the language on that profile to English.
Rules of using a netflix account:
What if the account already has 5 profiles? You can use a random profile and change the language to any you want. If it doens't last, you'll get a new one.
If you don't follow the rules, you will get suspended .